Ventilation valve



1. Ventilation valve

2. Ventilation valve

Figure 1.1 of a first embodiment of a ventilation valve showing our new design;

Figure 1.2 is another perspective view thereof is another perspective view thereof;

Figure 1.3 is a front elevation view thereof, the rear elevation view being the minor image of Figure 1.3 ;

Figure 1.4 is side elevation view thereof, the other side elevation view being the mirror image of Figure 1.4 ;

Figure 2.1 of a second embodiment of a ventilation valve showing our new design;

Figure 2.2 is another perspective view thereof is another perspective view thereof;

Figure 2.3 is a front elevation view thereof, the rear elevation view being the minor image of Figure 2.3 ; and

Figure 2.4 is side elevation view thereof, the other side elevation view being the mirror image of Figure 2.4 . 

CLAIM The ornamental design for a ventilation valve, as shown and described. 